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Issue 17499002: Change kMaxLowEntropySize to have 8000 values instead of 8192. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: Created 7 years, 6 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include <cmath> 5 #include <cmath>
6 #include <limits> 6 #include <limits>
7 #include <numeric> 7 #include <numeric>
8 8
9 #include "base/basictypes.h" 9 #include "base/basictypes.h"
10 #include "base/guid.h" 10 #include "base/guid.h"
11 #include "base/memory/scoped_ptr.h" 11 #include "base/memory/scoped_ptr.h"
12 #include "base/prefs/testing_pref_service.h" 12 #include "base/prefs/testing_pref_service.h"
13 #include "base/rand_util.h" 13 #include "base/rand_util.h"
14 #include "base/strings/string_number_conversions.h" 14 #include "base/strings/string_number_conversions.h"
15 #include "chrome/common/metrics/entropy_provider.h" 15 #include "chrome/common/metrics/entropy_provider.h"
16 #include "chrome/common/metrics/metrics_util.h" 16 #include "chrome/common/metrics/metrics_util.h"
17 #include "testing/gtest/include/gtest/gtest.h" 17 #include "testing/gtest/include/gtest/gtest.h"
18 18
19 namespace metrics { 19 namespace metrics {
20 20
21 namespace { 21 namespace {
22 22
23 // Size of the low entropy source to use for the permuted entropy provider 23 // Size of the low entropy source to use for the permuted entropy provider
24 // in tests. 24 // in tests.
25 const size_t kMaxLowEntropySize = (1 << 13); 25 const size_t kMaxLowEntropySize = 8000;
26 26
27 // Field trial names used in unit tests. 27 // Field trial names used in unit tests.
28 const std::string kTestTrialNames[] = { "TestTrial", "AnotherTestTrial", 28 const std::string kTestTrialNames[] = { "TestTrial", "AnotherTestTrial",
29 "NewTabButton" }; 29 "NewTabButton" };
30 30
31 // Computes the Chi-Square statistic for |values| assuming they follow a uniform 31 // Computes the Chi-Square statistic for |values| assuming they follow a uniform
32 // distribution, where each entry has expected value |expected_value|. 32 // distribution, where each entry has expected value |expected_value|.
33 // 33 //
34 // The Chi-Square statistic is defined as Sum((O-E)^2/E) where O is the observed 34 // The Chi-Square statistic is defined as Sum((O-E)^2/E) where O is the observed
35 // value and E is the expected value. 35 // value and E is the expected value.
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386 kMaxLowEntropySize); 386 kMaxLowEntropySize);
387 for (size_t i = 0; i < 2 * arraysize(kTestTrialNames); ++i) { 387 for (size_t i = 0; i < 2 * arraysize(kTestTrialNames); ++i) {
388 const std::string trial_name = 388 const std::string trial_name =
389 kTestTrialNames[i % arraysize(kTestTrialNames)]; 389 kTestTrialNames[i % arraysize(kTestTrialNames)];
390 EXPECT_EQ(provider.GetEntropyForTrial(trial_name, 0), 390 EXPECT_EQ(provider.GetEntropyForTrial(trial_name, 0),
391 cached_provider.GetEntropyForTrial(trial_name, 0)); 391 cached_provider.GetEntropyForTrial(trial_name, 0));
392 } 392 }
393 } 393 }
394 394
395 } // namespace metrics 395 } // namespace metrics
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